Pulp-screening machine



(No Model.)

G. D. ROWELL. PULP SCREENING MACHINE.

No. 493,781. Patented Mar. 21, 1893.

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GUILFORD D. ROWELL, OF A PPLETON, WISCONSIN.

PULP-SCREENING MACHINE.

SPECIFICATION formingpart f Letters Patent No. 493,787, dated March 21,1893.

Application filed April 2, 1891. i Serial No. 387,407. `(No model.)

To @ZZ whom it may concern,.-

Be it known that I, GUILFORD D. RownLL, of Appleton, in the county ofOutagamie and State of Wisconsin, have invented certain new and usefulImprovements in Pulp-Screening Machines; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it pertains tomake and use it, reference being had to the accompanying drawings, whichform part of this specication.

My invention relates to an improvement in pulp screening machines: andit consists in certain novel features of construction, arrangement andcombinations of parts which will be fully described hereinafter andparticularly pointed out in the claims.

Figure 1 is a perspective View of a machine which embodies my inventioncomplete. Fig. 2 is a detached plan View of crank adjusting mechanism.Fig. 3 isa cross section through a screw bar or leg and the guidestherefor' f taken on the dotted line X-X of Fig. l.

A, indicates the bed of my machine which consists of an open frame-workof any suitable construction, shape, or size that may be preferred.Journaled to one side of this framework is a horizontal shaft B carryingan operating pulley C of any suitable size that may be preferred, andaround which a belt from any suitable power is passed.

Secured to each end of the driving shaft B is a balance wheel D,carrying a crank or wrist pin which will be fully described hereinafter.

Extending outward from the bottom of each end of the bed A'is a spindleor shaft E upon which the lower end of an arm F is journaled. The upperend of this arm Fis bifurcated as shown and the extremities of thesebifurcated ends are provided with shaft bearings in which is placed thehorizontal spindle G. Journaled upon the spindle G is a boxing II toopposite sides of which are secured the rods I the upper ends of theserods being likewise secured to a boxing .I mounted to rock on a spindleJ which is formed upon the lower end of the,

screen supporting bar or leg K. Secured to the upper edge of the bedAare the laterally extending bearings L which form guides for the lowerends'of the screen bars K.

Placed upon the top of the bed A is atrough M which is also provided atopposite ends with laterally extending bearings N which form guides forthe upper ends of the screen supporting bars K. Formed in the innersides of these bearings L, N, are vertical -V -shaped grooves O, and thevertical edges of the screen supporting bars are made V-shape so as tofit in the V-shaped grooves of the said bearings. By means of thisconstruction these bearings not only serve as guides for the screensupporting bars, but also support them against any lateral movement ofthe bars in the bearings. I am enabled to thus do away with guides or`bearing plates which have heretofore been placed on the upper sides ofvthe trough and in which arms, which project from the sides of thetrough have extended.

The upper ends of the screen supporting bars K, have laterally extendingarms P upon which the ends of the screen Qare placed and secured in anysuitable manner.

L L', indicate inclined braces secured to each end of the screen andextending down and secured to the respective screen bars or legs atopposite ends.

Formed eccentrically in the outer face of each of the two balance wheelsD is a circular cavity R, in which is placed and closely fitted, acircular disk S. Extending laterally from this disk and eccentricallythereto is a wrist pin T upon which is journaled a boxing U to which theouter ends of the connecting rods or pitmen V are connected in anydesired manner. The inner ends of these rods Vare secured to a boxing Wwhich is journaled upon the spindle G inside of the boxing H heretoforementioned. As shown the ends of the rods V and I are adjustably securedto their boxings for the purpose of lengthening or shortening the rodsand thus regulate the relative positions of the parts to which they areattached.

Made transversely through the balance wheels within the eccentric recessR are the circular openings X through which pass the bolts Y, which alsopass through the disk S, and by means of which the disk is clampedfirmly within the recess, while at the same time it is allowed a partialrotation, as will be readily understood. By placing the wrist pineccentrically upon the disk and adjustably securing the diskeccentrically upon the balance wheel, I am enabled by rotating the diskto turn the wrist pin to carry the wrist pin away from or bring ittoward the shaft and thus regulate the stroke which is imparted by theWrist pin as the driving shaft is revolved.

Thepulpscreeningmachinesheretoforegenerally used have caused greatinconvenience and wear to the machinery and building by vibrations andjar because the gearing to raise and lower both ends of the screenoperated ormoved in unison and in the same direction hence thevibrations and jar of the heavy inachinery pushing and pulling in unisonand in the same directions will cause the building to vibrate incadence. This is very dangerous and Wearing on the building and contentsparticularly in view of the heavy weight of the loaded screen (usuallyseveral tons) and consequent power necessary to move it. To obviate thisvibration in cadence of the machinery and building, the crank mechanismsare arranged oppositely on the drive shaft B, so that when one pitman ismoving up and outward and its toggle links are moving away from theshaft, the other pitman is moving in the opposite direction and inwardand down and its toggle links toward the shaft. By this arrangement whenone pitman is pushing the other pitman is pulling. Consequently thegearing at opposite ends of the screen works in opposite directions;they counteract each others effect on the building so that the buildingcannot vibrate in unison and cadence with the machinery. Of course theinvention is not limited to the use of cranks or adjustable pins.driving gear can be varied by the adjustable crank mechanisms.

The construction and arrangement above described reduce the friction ascompared with mechanisms heretofore constructed for this purpose, andenable me to run the machine at a much rhigher speed, and thus do agreater amount of and more effectual work.

Having thus described my invention, I claim- 1. In a pulp screeningmachine, the bed plate, the trough thereon, a screen above the trough,supporting bars depending from the screen, guides therefor, arms pivotedat their lower ends to the bed and having their upper ends bifurcated,spindles extending through the said bifurcated ends, a boxing journaledon each spindle, a boxing journaled upon the lower end of eachsupporting bar, connections between the said boxes, a driving shaft, andconnections between the driving shaft and the said pivoted arms, theparts combined substantially as set forth.

2. In a pulp screening machine, the combination of a bed, the screenhaving depending legs, guides therefor on the bed, arms pivotallymounted at their lower ends, rocking boxes carried by the upper ends ofsaid arms, rocking boxes carried by said legs, links connecting saidboxes on the legs and on said arms, a second box journaled on eachpivoted arm, a driving shaft, and pitmen connected to said second boxesand connected with and operated by said shaft, substantially as shownand described. y

3. In combination, a support, a screen having depending bars at oppositeends, guides on the support for said bars to prevent lateral movement,each bar having a lateral spindle at its lower portion, reciprocatingtoggle links at opposite ends of the screen at their lower endsrespectively mounted on the support and at their upper ends respectivelymounted on said spindle, a drive shaft, pit-men respectively connectedto the joints of said links to swing them, and mechanism on the shaft.to reciprocate the pitmen, substantially as described. The stroke ofthe In testimony whereof I affix my signature in presence of twowitnesses.

GUILFORD D. ROWELL.

Witnesses:

JOHN BoTTnNsEK, G. W. NOBLE.

